EN
The influence of the presence of bacteriophage ZD5, temperature, pH and the interaction of these factors on survival of Y. enterocolitica cells in pond water and buffers was examined. The presence of bacteriophage ZD5 and temperature have substantial influence on survival of Y. enterocolitica cells in buffers with different pHs. The statistical analysis showed a significant influence of the presence of phage ZD5 on the decrease in the number of Y. enterocolitica cells incubated in buffers with pHs 6, 7, and 8. In the presence of phage ZD5, pH itself turned out to be of no significance because the average numbers of Y. enterocolitica cells obtained in pHs 6, 7, and 8 did not differ significantly at p≤0.05. Statistical analysis confirms significant influence of the presence of phage ZD5 on the reduction of the number of Y. enterocolitica cells in pond water at both 4°C and 20°C. The lowest average value of the number of cells was obtained at 4°C in the presence of phage ZD5, both in the tested buffers and in the pond water.